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Scoping study for refinements to runoff assessments - PS2243

The Chemicals Regulation Directorate are currently considering a recommendation from the Environmental Panel of the Advisory Committee on Pesticides that they include surface runoff within calculations of exposure of the aquatic environment to pesticides. Uptake of the recommendation would be a departure from current practice where spray drift and drainflow are considered as the dominant routes of entry. Where pesticides fail the basic risk assessment, there are established procedures in place to refine the assessment at higher tiers. For the exposure assessment, these cover (i) inclusion of mitigation measures; (ii) implications of application to a specific crop; and (iii) more detailed consideration of the range in environmental conditions in the UK leading to a more advanced calculation of exposure. Such approaches are well-developed for spray drift and drainage, but are lacking for surface runoff. The aim of the proposed project is to scope out options and requirements for approaches to higher-tier assessment of aquatic exposure via runoff.
1. Consider modelling, including mitigations options, for higher-tier runoff assessment, including approaches already used outside of the UK;
2. Consider the suitability of models and modelling approaches for UK conditions, model complexity, model weaknesses and model data requirements/costs;
3. Hold a workshop with CRD staff and key stakeholders to present results and discuss development of higher tier runoff guidance;
Project Documents
• FRP - Final Report : Scoping study for refinements to runoff assessments   (1209k)
• ANX - Annex : PS2243 Appendix1a   (1947k)
• ANX - Annex : PS2243 Appendix1b   (289k)
• ANX - Annex : PS2243 Appendix1c   (409k)
Time-Scale and Cost
From: 2011

To: 2011

Cost: £19,857
Contractor / Funded Organisations
ADAS UK Ltd., University - York
Pest and Weed Control              
Pesticide use              
Plants and Animals              
Risk assessment and management              
Fields of Study
Pesticide Safety